The new Rycote suspensions, which are not _too_ expensive, are very good....
Dave
On 6 June 2013 23:22, Eric Carmichel <e...@elcaudio.com> wrote:
> Hi Michael,
> Thanks--I'll shout if need be.
> RE earthquake detectors: I suppose a good shock mount with seismic
> isolation would help. Maybe filtering infrasonic frequencies would help
> some, too, but low vibrations at mic could affect the audible frequencies?
> That is, mechanically modulate frequencies (FM distortion) or cause basic
> overload at preamp front end and ahead of active filtering. Maintaining a
> favorable SNR can be a challenge with Ambisonic recording because
> compression is avoided. Everday sounds can be LOUD when they're close to
> our heads. Ever measure the SPL of a newspaper being rattled while at a
> distance of 1 foot? I'll bet it's *louder* than we might guess. RE loudness
> recruitment (a topic on its own): Without compression, everyday sounds can
> be quite alarming to new hearing aid users. For those of us who can accept
> a wide dynamic range, we take much of this for granted.
> Walkabout files: The very best, or at least convincing, binaural file I
> have listened to was made with in-the-ear 1/8-inch mics. Don't remember
> where I got these, but they came with a silicon rubber *ring* that fit well
> within concha, placing the mic roughly at the external auditory meatus and
> without obstructions. These purportedly had self-noise of 10 dBA -- quite
> low for a weenie-sized electrets (and possibly an exaggeration). Their tiny
> cables looked disproportionate to their two XLR ends, which held some
> active components (a FET or something -- never looked). Anyway, recordings
> made with these mics were truly eery to listen to--I would dodge things
> that appeared to be at my feet, and the sound of a squeaky would floor was
> ghostly. At the time of recording, all I did was meander through the house,
> pet my cat, bounce a tennis ball, and record a few everyday events. This
> particular binaural recording took my whole body into account -- a full body
> transfer function -- and probably wouldn't have been so effective for any
> other listener. Don't know whether I can create the same "eery" experience
> in near (or sound) field and with a cubic arrangement of speakers. Could be
> fun...
> Thanks, as always, for insights and help.
> Best,
> Eric C.
>
>
>
> ________________________________
> From: Michael Chapman <s...@mchapman.com>
> To: Eric Carmichel <e...@elcaudio.com>; Surround Sound discussion group <
> sursound@music.vt.edu>
> Sent: Thursday, June 6, 2013 2:02 PM
> Subject: Re: [Sursound] Subsumption Architecture meets Ambisonics?
>
>
> >
>
> Seem to recall seeing various binaural 'walking about' files ... but don't
> ask me where ...
>
> The problem seems to be (and ask someone else) that any omni mic (and a
> tetrahedral is -amongst other things- an omni) is a very sensitive
> 'earthquake detector' ....
>
> As for files: For my sins I run a server in Geneva.
> One off downloads are not a problem.
> Uploads mean turning off (or perhaps 'down') the security* for a while.
> So if you are really stuck, shout.
>
> Michael
>
>
> *I physically installed it.
> Before it had a URL (i.e. DNS), just an IP address, during the
> installation when I was putting it in place it started being attacked ...
> aint the Internet wonderful ;-))>>
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--
As of 1st October 2012, I have retired from the University, so this
disclaimer is redundant....
These are my own views and may or may not be shared by my employer
Dave Malham
Ex-Music Research Centre
Department of Music
The University of York
Heslington
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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